You won't find a free lawyer for this. ... assuming you have a claim.
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I am sorry that you had to suffer such an invasive situation. There are a number of websites and companies who help prevent illegal and abusive usage of the internet. However, privacy is under the category of tort law and you would be most likely need to retain a litigator, competent in both the privacy laws and internet laws, in order to successfully prosecute or press any charges against the perpetrator. You also would probably want to hire someone who acts as a private investigator but is trained specifically in tracing and decoding internet traffic and and cookies, etc. Lastly, if you post or shoot out an email seeking others who have suffered in similar situations on the website, you might consider seeking a class action attorney to lower your costs and benefit the class of persons who have been negatively affected, as you were. Just a note or two: the website which posted the pictures will most likely have terms which, if you signed up with or opened an account with them, likely consented to their terms. However, from the facts, it seems as if you did not "belong" or open an account with them, and boilerplate contract terms can still be contested. Also, an issue you might have to account for is damages (one of the four essential components to a tort action). That being said, if the pictures were explicit and embarassing, a competent attorney would find out more information and see on what grounds to bring charges. Good luck and I hope this was helpful.